Sewing-machine.



M. SANDT.

SEWING MACHINE.

APPLIUATION FILED MAY 23, 1912.

Patented May 26, 1914.

Wines COLUMBIA PLANOCIRAPH on wAemNu'r M uvc4 MAX SANDT, OF BIELEFELD,GERMANY,

FABRIK VQRMALS Dij'RKOPP 8: C0., BIELE ASSIGNOR TO BIELEFELDERMASCHINEN- FELID, OF BIELEFELD, GERMANY, A FIRM.

SEWINGJVIACHINE.

Specification of Letters Patent.

Application filed May 23, 1912.

Patented May 26, 191. Serial No. 699,240.

To all whom it may concern Be it known that I, MAX SANDT, a citizen ofthe Empire of Germany, and residing at Bielefeld, Germany, have inventedcertain new and useful Improvements in Sewing- Machines, of which thefollowing is a specification.

My invention relates to driving gear for the needle-shaft of embroideryand similar sewing-machines.

A primary object of my invention is to provide an improved driving gear,for v1- brating the needle-shaft laterally, whlch not only is of verysimple construction, but also both very suddenly reverses the directionof motion and causes a stoppage to occur shortly before in order toallow the needle to puncture the fabric.

One illustrative embodiment of my invention is diagrammaticallyrepresented by way of example in the accompanying drawing, whereinFigure 1 is a side elevation showing the entire driving gear, and Fig. 2is a plan of the link motion only.

Referring to the drawing, the needle-shaft a is guided vertically in aguide I) which is provided with lateral arms 6 mounted in guides b sothat the needle shaft may be laterally displaced. The needle-shaft isdriven vertically by the crank 0 and the intermediate link (Z, provisionbeing made in the link (Z for the lateral movement of the needle-shaft.To this end the link (Z is pr0- vided at its lower end with a sleeve (Zwherethrough slides an arm 6Z2. This arm (Z projects laterally from acollar (Z which is mounted on the needle shaft and held in ad justedposition by a set screw d. Thus, as the needle shaft moves laterally thearm (Z slides in the sleeve (Z. The guide I) is oscillated laterallythrough the medium of a suitably arranged block 6 to which is at tacheda connecting-rod f for imparting the oscillating motion.

The breadth of the stitch, 2'. e. the amount which the needle-shaft isto be oscillated or vibrated laterally, is determined by a peculiarlyconstructed link-mechanism. This mechanism comprises a triangulareccentric it fast on shaft 9 driven in suitable manner. This eccentricruns in a small box or link 2' and reciprocates the same and its guidein a rotatably mounted disk Z which is stationary when. the machine isrunning.

This disk Z is rotatable and can be adjusted so as to vary the positionof the slot is, in which the guide 7; travels, from vertical tohorizontal or any position therebetween. One end of the connecting-rod fis attached to the outside of the box 2' and its other end with theblock 6, which is slidably mounted on one of the arms 6, being held inadjust ed position by a suitable set screw 6. N ow when the slot in thedisk Z which guides the guide Z; is vertical, as shown in Fig. 1, it isobvious that the eccentric will reciprocate the link a verticallycorresponding to the amount of the eccentricity and rock one end of therod f up and down. In this position, therefore, although the eccentricrotates, practically no horizontal reciprocatory motion will be impartedto the needle-shai.t except that due to the change in angularity of thelink f and this being very slight the needle will have practically nolateral move ment. Consequently, in this position of the gear themachine can be used for sewing like any ordinary sewing machine in whichthe needle-shaft is moved only vertically. If the disk f be rotated 90to the right or left, as indicated in dotted lines in Fig. 1, the linktogether with its guide Z; is moved in a plane parallel with the fabricto be sewn, and consequently in this position the eccentric or cam itwill operate to move the link 2 in the direction of the length of therod f or horizontally and will thereby cause the fullest possiblereciprocation of the red and consequently the needle will have themaximum lateral displacement. If, on the contrary, it is wished todiminish the lateral movement of the needle-shaft, the disk Z will beplaced in an intermediate position. This disk Z may be adjusted by handand to this end it is rotatably mounted on the shaft 9. It is obviousthat the hand or any convenient mechanism may be used to hold the diskin adjusted position, as for instance, a friction pawl may be mounted toengage the periphery of the disk. It is not, however, deemed necessaryto show any specific means to this end as such means are within theskill of any mechanic and no claim is laid to any particular means. Itis to be noted that, in order to provide a dwell at each end of thelateral reciprocation of the needle-shaft and to thus permit penetrationof the cloth, the eccentric or cam 71. has two portions 7a which areconcentric with the shaft. \Vhen these 10 needle-shaft verticallydisplacealole therein,

and means for Vertically reciprocating the needle-shaft in said guide,of a rotatably adjustable slotted disk, a link having a guide able toreciprocate in the slot in the disk, a shaft, an eccentric fast on theshaft and r0- tatable in the link, and a connecting-rod having one endpivotally connected to the link and the other end pivotally connected tothe first named guide.

In testimony whereof, I affix my signature in the presence of twowitnesses.

MAX SANDT.

WVitnesses WVILLY FRIDLY, GEORGE AOKERMANN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

